David J. Linden is a Professor in the Department of Neuroscience at the Johns Hopkins University School of Medicine. He is the author of Unique: The New Science of Human Individuality, The Accidental Mind: How Brain Evolution Has Given Us Love, Memory, Dreams, and God, The Compass of Pleasure: How Our Brains Make Fatty Foods, Orgasm, Exercise, Marijuana, Generosity, Vodka, Learning, and Gambling Feel So Good, and Touch: The Science of the Hand, Heart, and Mind. His laboratory has worked for many years on the cellular substrates of memory storage, recovery of function following brain injury and a few other topics.